Question 88Refrigeration & AC - QMED

The correct answer is A) liquid line box solenoid. In a refrigeration system with low-side pump down, the temperature of the refrigerated space is controlled by a thermostat wired to the liquid line box solenoid. The liquid line box solenoid is the valve that opens and closes to allow or restrict the flow of refrigerant liquid into the refrigerated space, thereby controlling the temperature. The thermostat senses the temperature in the refrigerated space and sends a signal to open or close the liquid line box solenoid to maintain the desired temperature. The other options are incorrect because: B) the suction line solenoid is not involved in temperature control, C) the thermostatic expansion valve controls superheat, not temperature, and D) the low-pressure cutout switch is a safety device that shuts down the compressor, not a temperature control device.